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STOUGHTON PETTEBONE, OF NIAGARA FALLS, 'NEW. YORK.

Letters Patent No. 71,783, dated December 3, 1867.

IMPROVED usruoo or SAVING AND UTILIZING THE ALKALINE mouons use]: In TREATING srnaw, woon, ct.

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Be it known that I, Sroucuron Psrruuonmof Niagara Falls, in the county of Niagara, and State of New York, have invented a new and useful Mode of Saving and Utilizing the Alkali Liquors Used in subjecting and Subduing Straw, Wood, Grass, and other fibrous materials used in and for the manufacture of paper-stock and paper-pulp, preparatory to the bleaching thereof; and the following is a full, clear, andexact description thereof.

Two boilers or rotarics of the usual form are required, which should be of equal capacity. A stationary pipe or tube, to act as a siphon, is to be inserted vertically from the top or outside of the shell of the rotary or boiling-cylinder, nearly through the same, and into a perforated false bottom. The projecting and outside ends of these tubes or pipes are fitted with avalve and union-joint, so that the orifice tray be closed, and so as to connect the two boilers by a connecting-pipe or hose. The perforated false bottom, into which the pipe enters, is necessary to allow a free suction of liquor into the pipes unimpeded by the stock- Bcth boilers are to be filled with the usual quantity of stoclflund in the usual mode. Fill one with the usual quantity of alkali liquor. 'Then heat it up, or boil by steam in the usual manner, until the stock in this first boiler is fully subdued or subjcctcd. Then pump or run into the second rotary boiler from one-third to one-half the usual quantity of fresh alkali liquor. This should be done while the boiler is rotating, so as to havethe stock well saturated with the fresh liquor before the-waste liquor is transferred. The connecting-pipe or tube is then securely fastened at each end to the bcfore-mentioued vertical or siphon-pipes. Both valves at the ends of these pipes or tubes are then fully opened, when the steam and hot liquor will be instantly forced from the first boiler or rotary into the second, and will there fulfi l its function, as in the first, by suhduing and subjecting the paper-stock therein contained. By this modc, and using two boilers, this operation can be continued indefinitely, changing the hot liquor, by the force of the steam used inboiling, from one to the other boiler or rotary, wasting at each change a sufiicient quantity of the old liquor (beyond what is absorbed by the stock or destroyed by evaporation) to allow at each experiment the introduction into therotary of from one-third to one-half the usual quantity of fresh liquor. The liquor, in being forced from the boiler, passes over and through the mess of stock, which acts as a strainer or filter to catch and retain silicates and other impurities, leaving the liquor to pass off in a. comparatively pure state. From these impurities the stock is readily cleansed by water, in the manner hereiuafter stated.

By the means thus described, the stdck is subdued or subjected in a much less time than is required by the usual methods, is as completely and perfectly done, while there is a saving of from fifty to sixty per cent; of alkali liquor, and a proportionate saving of fuel. By the methods ordinarily used, the alkali liquors, when once used, are entirely wasted and thrown away, or are recovered in part byychemical appliances at a large expense- By employing the method above described, the full virtue and strength of the liquor are saved, and. a only a suificicnt quantity wasted to allow the introduction of a small quantitybf fresh liquor from time to time:

My intention consists in transferring the hot liquor from one vessel, cylinder, or rotary to another, to be used again and repeatedly; and I do not confine myself to any particular form of appliance or machinery to produce the result. The method above described is suggested as the most convenient mode of using the inven tion. Other modes or mechanical means of producing the same result may be employed.

Such transferring of the hot liquor from one vessel or rotary to another may be accomplished by using a perforated box inserted in one end of the boiler or rotary; and the transferring-pipe may be inserted, through a hollow journal, into such box, instead of passing vertically, through the boiler, into a false bottom, as before described; or such pipe, of siphon form, may be inserted into the boiler by any other mode under and by which i the liquor can be drawn or forced into the second boiler or rotary.

Another mode of transferring the liquor may be used, by which a large saving over present methods may be effected. A large tub, tank, or receiving-vessel may be placed at a convenient point, and the hot liquor be blown off or forced into such vessel, to be used again, after the rotary has been again filled with stock, and the duo proportion of fresh liquor put therein, If the process is worked in this manner, the value of the steam and heat will be lost, which would be saved by transferring steam and hot liquor together from one rotary to another, as before suggested; but a large saving would beefi'ected to manufacturers who employ but one rotary:

Still another mode of accomplishing the same result can be used, by creating a vacuum in the'boiler or rotary into which the waste alkali liquor is to be transferred. This vacuum may be created by using a common air-pump; and, when created, by opening the valves of the connecting-pipe, the hot liquor ivill instantly fill the rotary or boiler, and accomplish the same result in subduing the stock.

After the hot liquors are transferred from a boiler or rotary, by any of the methods beiore indicated, a' quantity of fresh water, cold or warm, can be pumped or run into the boiler, to facilitate the removal of the.

subdued stock, and also in part to wash the same, and remove impurities therefrom.

What I claim as my invention, and desire to secureby Letters Patent, is-- 1. I claim the saving and utilizing of the alkali liquor, after it has been once used, (employed by papermanufacturers in subduing or subjecting straw, wood, or other fibres,) by transferring the same from one boilingrotary or vessel to another, and strengthening it by the addition of fresh alkali liquor, substantially as above stated, instead of recovering the soda-ash from the waste liquor by a separate process well known to the trade, or wasting it absolutely, as is generally practised.

2. I claim the mode above indicated of transferring the said alkali liquor from one rotary to another, \vhile hot, by forcing the same under and by the pressure of steam used in boiling the material, substantially as above described I 3. I claim, as another modeof accomplishing the same result, the use of the principle of a vacuum formed iu the vessel or rotary to which the said waste alkali liquor is to be transferred, by means of an air-pump,' and thus transferring the liquor and steam by atmospheric pressure, substantially as above described.

4. I claim the saving of the waste alkali liquor by transferring the same into a receiving-tank or vessel, to he used over again in boiling paper-stock, substantially in the manner above indicated.

Dated Niagara Falls, New York, September 30, 1867.

STOUGHTON PETTEBONE.

Witnesses:

J. G. QOLTOEI, A G. Four). 

